Electrochemical corrosion behavior of Ti–35Nb–7Zr–5Ta powder metallurgic alloys after Hot Isostatic Process in fluorinated artificial saliva

Abstract

The present study aimed to evaluate the effect of the Hot Isostatic Process (HIP) process on the microstructure, phase stability and corrosion resistance of Ti35Nb7Zr5Ta powder metallurgy alloys. The corrosion resistance of titanium alloys was tested by analyzing the open circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and ion release in physiological Fusayama solution. Polarization curves showed that the Ti–35Nb–7Zr–2Ta alloy presented good passivation behavior thanks to its low current densities (106 Ω cm2) at low frequencies and phase angles close to −90° according to the EIS results with less ion release.

Keywords

• HIP
• β-Type titanium alloy
• Fusayama
• EIS
• OCP
• Ion release